1. School of Electrical Engineering, Graduate School of Semiconductor Technology, Graphene/2D Materials Research Center, Center for Advanced Materials Discovery towards 3D Display, KAIST, Daehakro, Yuseong-gu, Daejeon 34141, Republic of Korea
2. School of Electronics and Electrical Engineering, Convergence Semiconductor Research Center, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin-si, Gyeonggi-do 16890, Republic of Korea